AP CSA 4.2 (For Loops)

Which of the following for loops could be used to replace the for loop in the original code segment so that the original and the revised code segments store the same value in total?

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Which of the following code segments could replace the while loop in the method digitSum without changing the value returned by the method?

• I only

• II only

• III only

• I and II

• II and III

Which of the following best explains how the difference in the two loop headers affects the output?

• The output of the code segments is the same because the loops in each code segment terminate when i is 10.

• The output of the code segments is the same because the loops in both code segments iterate 10 times.

• The output of the code segments is different because code segment I iterates from i = 0 to i = 9 and code segment II iterates from i = 1 to i = 10.

• The output of the code segments is different because code segment I iterates from i = 0 to i = 10 and code segment II iterates from i = 1 to i = 11.

• Neither code segment produces output because both loop conditions are initially false.

Which of the following best explains how changing i < n to i <= n in line 2 will change the result?

• An additional value will be printed because the for loop will iterate one additional time.

• One fewer value will be printed because the for loop will iterate one fewer time.

• There will be no change to the program output because the loop will iterate the same number of times.

• An infinite loop will occur because the loop condition will never be false.

• The body of the loop will not execute at all because the loop condition will initially be false.

Consider the following method definition. The method printAllCharacters is intended to print out every character in str, starting with the character at index 0.

Which choice best describes the difference, if any, in the behavior of this statement that will result from changing x < str.length() to x <= str.length() in line 3 of the method?

• The method call will print fewer characters than it did before the change because the loop will iterate fewer times.

• The method call will print more characters than it did before the change because the loop will iterate more times.

• The method call, which worked correctly before the change, will now cause a run-time error because it attempts to access a character at index 7 in a string whose last element is at index 6.

• The method call, which worked correctly before the change, will now cause a run-time error because it attempts to access a character at index 8 in a string whose last element is at index 7.

• The behavior of the code segment will remain unchanged.

Code segment 1 prints the sum of the integers from 1 through 30, inclusive. Which of the following best explains how the output changes from code segment 1 to code segment 2?

• Code segment 1 and code segment 2 will produce the same output.

• Code segment 2 will print the sum of only the even integers from 1 through 30, inclusive because it starts sum at zero, increments k by twos, and terminates when k exceeds 30.

• Code segment 2 will print the sum of only the odd integers from 1 through 30, inclusive because it starts k at one, increments k by twos, and terminates when k exceeds 30.

• Code segment 2 will print the sum of only the even integers from 1 through 60, inclusive because it starts sum at zero, increments k by twos, and iterates 30 times.

• Code segment 2 will print the sum of only the odd integers from 1 through 60, inclusive because it starts k at one, increments k by twos, and iterates 30 times.

Which of the following best explains how the output changes from code segment I to code segment II?

• Both code segments produce the same output, because they both iterate four times.

• Both code segments produce the same output, because they both iterate five times.

• Code segment I prints more values than code segment II does, because it iterates for one additional value of k.

• Code segment II prints more values than code segment I, because it iterates for one additional value of k.

• The code segments print the same values but in a different order, because code segment I iterates from 1 to 5 and code segment II iterates from 5 to 1.

Which of the following code segments will produce the same output as the code segment above?

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Which of the following code segments will produce the same output as the code segment above?

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Which of the following code segments will produce the same output as the code segment above?

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